<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意:只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon>
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类</span>
          <!-- 选择商品分类的级联选择器 -->
          <el-cascader :options="catelist" :props="catProps" v-model="selectedCatKeys" @change="handleChanged"
            clearable change-on-select></el-cascader>
        </el-col>
      </el-row>

      <!-- tab标签页 -->
      <el-tabs v-model="activeName" type="card" @tab-click="handleTabClick">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>

          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                  size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮  -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>

          <!-- 静态参数表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染tag标签 -->
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                  size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>

        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改'+titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        //商品分类数据列表
        catelist: [],
        // 指定级联选择器的配置对象
        catProps: {
          // 具体选定的值的属性(根据后台接口文档)
          value: 'cat_id',
          // 你所看到的是那个属性
          label: 'cat_name',
          // 指定父子嵌套用的是哪个属性
          children: 'children',
          //指定交互方式
          expandTrigger: 'hover'
        },
        // 选中的父级分类的id数组(级联选择框双向绑定的数组)
        selectedCatKeys: [],
        // 被激活的页签名字
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态参数的数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        //添加参数或属性的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [{
              required: true,
              message: '请输入活动名称',
              trigger: 'blur'
            },
            {
              min: 3,
              max: 5,
              message: '长度在 3 到 5 个字符',
              trigger: 'blur'
            }
          ]
        },
        //控制修改对话框的显示与隐藏
        editDialogVisible: false,
        //修改的表单数据对象
        editForm: {
          attr_name: ''
        },
        //编辑表单的验证规则对象
        editFormRules: {
          attr_name: [{
              required: true,
              message: '请输入活动名称',
              trigger: 'blur'
            },
            {
              min: 3,
              max: 5,
              message: '长度在 3 到 5 个字符',
              trigger: 'blur'
            }
          ]
        }
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取商品分类数据
      async getCateList() {
        const {
          data: res
        } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败')
        }
        this.catelist = res.data
        // console.log(this.catelist)
      },
      // 级联选择器选中项变化时触发这个函数
      handleChanged() {
        this.getParamsData()
      },
      // tab页签点击事件的处理函数
      handleTabClick() {
        // console.log(this.activeName)
        this.getParamsData()
      },
      //获取参数数据
      async getParamsData() {
        // console.log(this.selectedCatKeys)
        //选中的不是三级分类
        if (this.selectedCatKeys.length !== 3) {
          this.selectedCatKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        //选中的是三级分类
        // console.log(this.selectedCatKeys)
        // 根据所选分类的id和当前所处的标签面板，获取对应的参数数据
        const {
          data: res
        } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: {
            sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('参数获取失败')
        }
        // console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [],

            //控制输入框的显示与隐藏
            item.inputVisible = false

          //文本框中输入的值
          item.inputValue = ''
        })
        console.log(res.data)
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      //监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      //点击按钮添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return

          const {
            data: res
          } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })

          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮，显示修改对话框
      async showEditDialog(attr_id) {
        //查询当前参数的信息
        const {
          data: res
        } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id }`, {
          params: {
            attr_sel: this.activeName
          }
        })
        if (res.meta.status !== 200) {
          this.$message.error('获取参数信息失败')
        }
        //请求成功就将数据保存到编辑的表单对象身上
        this.editForm = res.data
        this.editDialogVisible = true
      },
      //监听编辑对话框的关闭，重置表单
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      //点击按钮修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const {
            data: res
          } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 200) {
            return this.$message.error('编辑参数失败')
          }
          this.$message.success('修改成功了')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      //根据ID删除参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消')
        }
        //删除的业务逻辑
        const {
          data: res
        } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if (res.meta.status !== 200) {
          this.$message.error('删除失败')
        }
        this.$message.success('删除成功')
        this.getParamsData()
      },
      //文本框失去焦点，或按下了enter都会出发
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        //如果没有return，那么说明用户输入了内容，则需要做后续操作
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 调用接口把对attr_vals的操作，保存到数据库
        this.saveAttrVals(row)
      },
      // 把对attr_vals的操作，保存到数据库
      async saveAttrVals(row) {
        //发起数据请求保存这次操作
        const {
          data: res
        } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
      },
      // 点击按钮显示文本输入框
      showInput(row) {
        row.inputVisible = true
      },
      //删除tag
      handleClose(i, row) {
        //删除数组中的索引i，删除1项
        row.attr_vals.splice(i, 1)
        this.saveAttrVals(row)
      }
    },
    computed: {
      // 如果按钮需要被禁用，则返回true
      isBtnDisabled() {
        if (this.selectedCatKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的分类id
      cateId() {
        if (this.selectedCatKeys.length === 3) {
          return this.selectedCatKeys[2]
        }
        return null
      },
      //动态计算对话框标题文本
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    }
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-cascader {
    width: 300px;
    margin-left: 15px;
  }

  .el-tag {
    margin: 5px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
